What waste percentage should I use for tile?

10% is standard for simple square/rectangular rooms. Use 15% for diagonal patterns or rooms with many cuts. Use 20%+ for complex layouts or intricate patterns.

What size tile is easiest to install?

Larger tiles (12"×12", 18"×18") require more precision but fewer grout lines. Smaller tiles (4"×4") are more forgiving on uneven surfaces. Porcelain 12"×24" is popular for bathrooms.

Tile Calculator — How Many Tiles Do I Need?

Quick answer: Enter room size and tile size to calculate tiles needed, with waste factor and box count.

Calculate exactly how many tiles you need for any floor or wall project. Enter room dimensions and tile size to get tile count, waste-adjusted quantity, and number of boxes.

Last reviewed: April 2026Report an error

Room Length (ft)

Room Width (ft)

Tile Length (in)

Tile Width (in)

Waste (%)

Tiles Needed

132

120.0 sq ft — 120 tiles needed, 132 with waste.

Square Feet

120.0

Tiles Needed

120

Tiles with Waste

132

Boxes Needed

How to Use This Tile Calculator

1Enter room length and width in feet.
2Enter tile length and width in inches.
3Set waste percentage (10% is standard).
4Read tiles needed, tiles with waste, and boxes required.

Frequently Asked Questions

: 10% is standard for simple square/rectangular rooms. Use 15% for diagonal patterns or rooms with many cuts. Use 20%+ for complex layouts or intricate patterns.
: Larger tiles (12"×12", 18"×18") require more precision but fewer grout lines. Smaller tiles (4"×4") are more forgiving on uneven surfaces. Porcelain 12"×24" is popular for bathrooms.

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Tile Calculator — How Many Tiles Do I Need?

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Frequently Asked Questions

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